Here's a few that you missed...
https://steempeak.com/ - Steemit with a much better interface.
https://dmania.lol/ - Memes
https://www.parley.io/ - Reddit competitor - Parley - A Decentralized Discussion Engine Based on Steem
https://musing.io/ - Quora competitor, presumably
https://steemfilter.space/ - Find new content on Steemit
https://steembottracker.com/ - Track Steemit bots
RE: Introducing SteemBluePages: a directory of useful things on the Steem blockchain [+ 15 STEEM DOLLARS PRIZE FOR RESTEEMING THIS POST!]